ETYMOLOGY
from heed (careful attention, care, observation) + -y
EXAMPLE
“… Not wythstandynge (ryght worshipfull) I haue attempted an enterpryce in prouynge eche parcel of the pryuye masse to dysplease god, whiche I can neyther word, matier, ne reason accordynglye, and so am rather dyslyked then lyked of manye for thys my doyng, rather heady then heedy as they suppose: Howebeyt in case the sayd persons woll wythe me earnestly respect my bounden deutie in the sayd doyng, they (I doubte not (woll be rathere contented then discontented with me for the same. …”
From: A Treatise againste the preuee masse
By Edmund Gest, 1548
Lexicophilia 